The White House took aggressive aim at Amazon, with President Donald Trump putting in a call to Amazon founder Jeff Bezos Tuesday morning, after the company considered displaying the added cost of tariffs on certain items.

The White House lashed out at Amazon on Tuesday for reportedly planning to display how much of a product’s cost comes from Trump’s tariffs. Doing so would emphasize to consumers that U.S. tariffs are not paid by overseas companies, but by the American companies importing the goods, and then largely passed on to customers.

Amazon.com was forced to play down a report that it was considering displaying the impact of tariffs during its online checkout process after President Trump called company founder Jeff Bezos and the White House said such a move would be “a hostile and political act.